Long-lived and Other Asset Impairments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use	$ 352	$ 495	$ 0	$ 0
Impairment of long-lived Assets to be disposed of		495	0	0
Middle East/North Africa/Asia [Member]
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use	175
Europe/Sub-Sahara Africa/Russia [Member]
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use	28
Latin America [Member]
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use	149
Land Drilling and Workover Rig Operations [Member]
Property, Plant and Equipment [Line Items]
Impairment of long-lived Assets to be disposed of					$ 143